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Merge pull request #27 from randomstuff/master
Add stackcollapse-gdb for the poor man's profiler
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brendangregg committed Jun 3, 2014
2 parents 3d703c6 + 9e9b9df commit c150419
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67 changes: 67 additions & 0 deletions stackcollapse-gdb.pl
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#!/usr/bin/perl -ws
#
# stackcollapse-gdb Collapse GDB backtraces
#
# Parse a list of GDB backtraces as generated with the poor man's
# profiler [1]:
#
# for x in $(seq 1 500); do
# gdb -ex "set pagination 0" -ex "thread apply all bt" -batch -p $pid 2> /dev/null
# sleep 0.01
# done
#
# [1] http://poormansprofiler.org/
#
# Copyright 2014 Gabriel Corona. All rights reserved.
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at docs/cddl1.txt or
# http://opensource.org/licenses/CDDL-1.0.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at docs/cddl1.txt.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END

use strict;

my $current = "";
my $previous_function = "";

my %stacks;

while(<>) {
chomp;
if (m/^Thread/) {
$current=""
}
elsif(m/^#[0-9]* *([^ ]*) ([^ ]*) ([^ ]*) ([^ ]*)/) {
my $function = $3;
my $alt = $1;
if(not($1 =~ /0x[a-zA-Z0-9]*/)) {
$function = $alt;
}
if ($current eq "") {
$current = $function;
} else {
$current = $function . ";" . $current;
}
} elsif(!($current eq "")) {
$stacks{$current} += 1;
$current = "";
}
}

foreach my $k (sort { $a cmp $b } keys %stacks) {
printf "$k $stacks{$k}\n";
}
60 changes: 60 additions & 0 deletions stackcollapse-recursive.pl
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#!/usr/bin/perl -ws
#
# stackcollapse-recursive Collapse direct recursive backtraces
#
# Post-process a stack list and merge direct recursive calls:
#
# Example input:
#
# main;recursive;recursive;recursive;helper 1
#
# Output:
#
# main;recursive;helper 1
#
# Copyright 2014 Gabriel Corona. All rights reserved.
#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at docs/cddl1.txt or
# http://opensource.org/licenses/CDDL-1.0.
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at docs/cddl1.txt.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END

my %stacks;

while(<>) {
chomp;
if(/^(.*)\s([0-9]*)/) {
my @stack = split(/;/, $1);
my $value = $2;

my @result = ();
my $i;
my $last="";
for($i=0; $i!=@stack; ++$i) {
if(!($stack[$i] eq $last)) {
$result[@result] = $stack[$i];
$last = $stack[$i];
}
}

$stacks{join(";", @result)} += $value;
}
}

foreach my $k (sort { $a cmp $b } keys %stacks) {
printf "$k $stacks{$k}\n";
}

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